you wanna ollie really high? do 1000 squats everyday for 2week then 2000 squats aday for 2week then 4000 aday so and so....
oh yeah stance width try to be in split position. you can really pop high while you on split on your board,

come on man is this question forreal? wow these are like common sense... just like there is no right or wrong way to snowboard,
there is no right or wrong way to stance width, its like this stance width should be what ever is comfy to you, if the board waist width is like 220cm but you have feet size 11 are you gonna wear boot size 4? def. not so what ever is comfertable when your riding should be your stance width, for as ollies
depends on strong your legs are, and how poppy your board is.

^I agree with most of your comments except for the last part about leg strength. It doesn't matter if you can squat 100lbs or 1000lbs (ie strong legs), if you don't have the skill to pull it off, it just isn't happening. Bottom line, practice is the only way to learn an ollie.